<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        html,body{
            width: 100%;
            height: 100%;
            background-color: darkgray;
        }
        .ding{
            width: 100%;
            height: 10%;
            background-color: cornflowerblue;
        }
        .dao{
            width: 100%;
            height: 30%;
            background-color: sienna;
            margin-top: 4%;
            float: left;
        }
        .zhong{
            width: 80%;
            height: 80%;
            margin: 0 auto;
            background-color: rosybrown;
        }
        .daohang{
            height: 35px;
            width: 20%;
            float: left;
            margin-left: 10%;
            text-align: center;

        }
        .daohang li{
            line-height: 35px;
            width: 25%;
            list-style: none;
            float: left;
        }
        .bei{
           width: 150%;
           height: 200px;
           display: none;
        }
        .bei li{
            background-color: black;
            color: white;
            line-height: 50px;
            width: 150px;
        }
        .daohang li:hover .bei{
            display: block;
        }
        .zuo{
            width: 40%;
            height: 100%;
            background-color: gold;
            opacity: 50%;
            float: left;
        }
        .you{
            width: 60%;
            height: 100%;
            background-color: indigo;
            float: right;
        }
        .xia{
            width: 100%;
            height: 10%;
            background-color: pink;
        }
    </style>
</head>
<body>
    <div class="ding">
        <div class="dao">
            <ul class="daohang">
                <li>李
                    <ul class="bei">
                        <li><a>牛逼</a></li>
                    </ul>
                </li>
                <li>刘
                    <ul class="bei">
                        <li>二货</li>
                    </ul>
                </li>
                <li>宋
                    <ul class="bei">
                        <li>大飞哥想如花</li>
                    </ul>
                </li>
                <li>马</li>
            </ul>
        </div>
    </div>
    <div class="zhong">
        <div class="zuo"></div>
        <div class="you"></div>
    </div>
    <div class="xia"></div>
</body>
</html>